The original of this was devised by Gaillard Smith, the
adapter of the detectaphone. The instrument is something like the
cytoscope, which the doctors use to look into the human interior.
Now, look through it again. Do you see the closet?"
Again I looked. "Yes," I said, "but will one of us have to watch
here all the time?"
He had been working on a black box in the meantime, and now he
began to set it up, adjusting it to the hole in the wall which he
enlarged on our side.
"No, that is my own improvement on it. You remember once we used a
quick-shutter camera with an electric attachment, which moved the
shutter on the contact of a person with an object in the room?
Well, this camera has that quick shutter. But, in addition, I have
adapted to the detectascope an invention by Professor Robert Wood,
of Johns Hopkins. He has devised a fish-eye camera that 'sees'
over a radius of one hundred and eighty degrees--not only straight
in front, but over half a circle, every point in that room.
"You know the refracting power of a drop of water.
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